Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Trains & railwayschoo-choochoo-choo /ˈtʃuː tʃuː/ noun [countable] spokenTTT a train – used by children or when speaking to childrenOrigin choo-choo (1900-2000) From the sound of a steam train ldoceonline.com
